The Underworld Arms Cyclops Compensator for the Military Armament Corp MAC 9 DS 1911, is a frame mounted compensator with a large expansion chamber that redirects the gas into a single top port that is similar in size to the Staccato XC and Sand Hawk. This 50 state legal compensator is made for unthreaded barrels and is anodized black. This compensator has a single slot lower rail, for a multi slot lower rail please see our other listing.  On most builds this compensator will not require recoil spring tuning but we offer a spring tuning kit if your build requires it.  Compatible holsters are available HERE This compensator increases the dimensions of the firearm so it requires a dedicated holster such as the ones we make, or a universal holster such as the MSP Tier 1, and the blackhawk omnivore light bearing.  Installation Video: Click Here Everything you will need for the install is included: locking block, screws, Blue Vibratite 121 thread locker, and an allen key.  Specifications Material: 7075-T6  Weight: 2.7oz Length Overall: 3.75" Length Added to Firearm: .825"